Pen



FIG. 1 is a perspective view of the pen.

FIG. 2 is a left side view thereof

FIG. 3 is a front view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is aback view thereof.

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof. 

The ornamental design for a pen, as shown and described. 